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This message always puts me into the yahoo blacklist temporarily. Is there anything wrong with it?

When ever I send this message to yahoo, I get a temporary block right after. I only sent it to myself, so no spam reporting done there.

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Why does this cause my ip to go into the Yahoo Blacklist? I do not see anything wrong with this. relay=mx-apac.mail.gm0.yahoodns.net[106.10.248.74]:25, delay=393, delays=390/0.03/2.7/0.11, dsn=4.7.0, status=deferred (host mx-apac.mail.gm0.yahoodns.net[106.10.248.74] said: 421 4.7.0 [TSS04] Messages from 49.206.228.251 temporarily deferred due to unexpected volume or user complaints - 4.16.55.1; see https://postmaster.verizonmedia.com/error-codes (in reply to MAIL FROM command)) Please help!

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It seems that it passed DKIM, DMARC, SPF. And even rDNS (PTR) is setup for the ip.

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Answer

I don’t think you’re doing anything wrong here, it’s just life as an email sender. Yahoo and Microsoft domains tend to use delivery deferral to throttle deliveries, whereas gmail tends to just put everything in the spam folder.

It’s not saying that there is anything wrong with this particular message, but that it doesn’t like the overall aggregate of messages that it’s seeing from you. This may be due to some things that are within your control, so make sure that your SPF records are correct, and that you are doing DKIM signing (which is particularly important for Yahoo – they invented it and enforce it very strictly).

I see that you are sending via your localhost – that is fine, so long as your local mail server is DKIM signing for you and relaying correctly. High volume delivery is almost impossible with free/open-source mail servers as they usually lack things like delivery throttling, or they have it but it’s difficult to configure.

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